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These graphic images of syphilis show the gruesome reality of what unprotected sex can lead to. This 38-year-old man needed hospital treatment after developing painful, crusted skin ulcers all over his body after contracting the STI. What started off as painless lumps developed into pus-oozing sores in two weeks, although it is likely he caught the infection months - or even years - earlier, doctors say. The pictures have been released by Chinese medics reporting in The Lancet medical journal to show the serious effects some strains of syphilis can have on the human body.